US4737874A - Magnetic head assembly with decreased setting time of adhesives - Google Patents
Magnetic head assembly with decreased setting time of adhesives Download PDFInfo
- Publication number
- US4737874A US4737874A US06/694,410 US69441085A US4737874A US 4737874 A US4737874 A US 4737874A US 69441085 A US69441085 A US 69441085A US 4737874 A US4737874 A US 4737874A
- Authority
- US
- United States
- Prior art keywords
- magnetic
- magnetic head
- read
- adhesive
- write head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/10—Structure or manufacture of housings or shields for heads
- G11B5/105—Mounting of head within housing or assembling of head and housing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/4806—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4826—Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive
Definitions
- the present invention relates generally to decreasing the setting time for an adhesive and more particularly to its application in the production of a magnetic read/write head assembly for tape drives and the like.
- the magnetic head proper is mounted on head-carrier by insertion.
- the plastic head-carrier is held with a preload force to the frame of the tape drive, then the magnetic head proper is inserted and the azimuth angle is adjusted to within ⁇ 3 seconds of arc before an adhesive is applied to lock the magnetic head in the head-carrier. For this reason, it is necessary to have the head-carrier wider than the magnetic head proper by 0.02 inches on either side. Such a large gap, however, would cause the locking adhesive to take too long to set and cure, thereby slowing the assembly line production considerably.
- the present invention solves this problem by simply providing two strips of corrugated metal, one in each of the two 0.02 inch gaps between the head-carrier sides and the side surfaces of the magnetic head proper. This permits azimuth adjustment prior to adhesive application and, by using a suitable adhesive, fast cure.
- the present invention provides a magnetic head assembly for tape drives and the like, comprising: a magnetic read/write head; a house having two opposite inside walls, one on either side of the magnetic read/write head; corrugated strips between each of the two opposite walls and the adjacent surface of the magnetic read/write head; and said corrugated strips bonded to the inside walls of the housing and to the adjacent surfaces of the magnetic read/write head by means of a fast curing adhesive during assembly.
- FIG. 1 is a plan view of the magnetic head assembly according to the present invention.
- FIG. 2 is a side elevation of the corrugated metal strip shown in the assembly of FIG. 1 prior to insertion in the assembly.
- a housing 10 of molded plastic has four inside walls 11, 12, 13 and 14.
- the inside walls 11 and 12 being the critical walls as far as the adjustment of the azimuth of a magnetic read/write head 15 retained within the inside walls 11, 12, 13 and 14 of the housing 10.
- the read and write apertures 16 and 17 should be exactly perpendicular to the travel direction of the magnetic tape, but practically it is required to maintain an azimuth angle within a tolerance of ⁇ 3 seconds of an arc. Accordingly, the azimuth of the magnetic read/write head must be adjusted within the housing 10, which itself is mounted in the head mounting fixture of the tape drive with a certain preload force, prior to its permanent gluing to the housing 10.
- the azimuth of the housing 10 itself is not critical and there is enough space between the magnetic read/write head 15 and the inside walls 11 and 12 to permit slight rotation of the magnetic head 15 to within the ⁇ 3 seconds of an arc tolerance.
- Two corrugated brass strips 18 and 19 are placed between the sides of the magnetic head 15 and the inside walls 11 and 12, respectively.
- the adhesive is applied to the spaces between the magnetic head 15 and the inside walls 11 and 12.
- the preferred adhesive is that sold under the trademark LOCTITE 420.
- the corrugated brass strips 18 and 19 are similar to that shown in side elevation in FIG. 2.
- the troughs and peaks are approximately 0.08 inches wide, while the angle A is approximately 30 degrees.
- the corrugation thickness T of the strip is approximatey 0.03 inches, its length is approximately 0.9 inches and its width is approximately 0.35 inches. These dimensions may, of course, be varied to suit the application.
- the adhesive may be applied first and then the strips inserted.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Magnetic Heads (AREA)
Abstract
Description
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/694,410 US4737874A (en) | 1985-01-24 | 1985-01-24 | Magnetic head assembly with decreased setting time of adhesives |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/694,410 US4737874A (en) | 1985-01-24 | 1985-01-24 | Magnetic head assembly with decreased setting time of adhesives |
Publications (1)
Publication Number | Publication Date |
---|---|
US4737874A true US4737874A (en) | 1988-04-12 |
Family
ID=24788707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/694,410 Expired - Lifetime US4737874A (en) | 1985-01-24 | 1985-01-24 | Magnetic head assembly with decreased setting time of adhesives |
Country Status (1)
Country | Link |
---|---|
US (1) | US4737874A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5196680A (en) * | 1989-04-04 | 1993-03-23 | Amphenol-Tuchel Electronics Gmbh | Cardan-type support for magnetic heads |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1119423A (en) * | 1966-03-22 | 1968-07-10 | Telefunken Patent | Magnetic head |
US3548393A (en) * | 1966-12-13 | 1970-12-15 | Instrumentation Schluberger So | Rack type mounting plate for magnetic head |
JPS58133616A (en) * | 1982-02-02 | 1983-08-09 | Canon Electronics Inc | Manufacture for magnetic head |
US4405961A (en) * | 1981-08-06 | 1983-09-20 | International Business Machines | Thermoelectric cooling of magnetic head assemblies |
-
1985
- 1985-01-24 US US06/694,410 patent/US4737874A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1119423A (en) * | 1966-03-22 | 1968-07-10 | Telefunken Patent | Magnetic head |
US3548393A (en) * | 1966-12-13 | 1970-12-15 | Instrumentation Schluberger So | Rack type mounting plate for magnetic head |
US4405961A (en) * | 1981-08-06 | 1983-09-20 | International Business Machines | Thermoelectric cooling of magnetic head assemblies |
JPS58133616A (en) * | 1982-02-02 | 1983-08-09 | Canon Electronics Inc | Manufacture for magnetic head |
Non-Patent Citations (2)
Title |
---|
Fazzio et al., "Read and Write Modular Head Assembly", IBM T.D.B., Oct. 1979, vol. 22, No. 5, p. 2087. |
Fazzio et al., Read and Write Modular Head Assembly , IBM T.D.B., Oct. 1979, vol. 22, No. 5, p. 2087. * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5196680A (en) * | 1989-04-04 | 1993-03-23 | Amphenol-Tuchel Electronics Gmbh | Cardan-type support for magnetic heads |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NORTHERN TELECOM LIMITED, P.O. BOX 6123, MONTREAL, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SIMS, DEWEY M. JR.,;REEL/FRAME:004416/0998 Effective date: 19841221 Owner name: NORTHERN TELECOM,CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SIMS, DEWEY M. JR.,;REEL/FRAME:004416/0998 Effective date: 19841221 |
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STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 4 |
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FPAY | Fee payment |
Year of fee payment: 8 |
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FPAY | Fee payment |
Year of fee payment: 12 |
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AS | Assignment |
Owner name: NORTEL NETWORKS CORPORATION, CANADA Free format text: CHANGE OF NAME;ASSIGNOR:NORTHERN TELECOM LIMITED;REEL/FRAME:010567/0001 Effective date: 19990429 |
|
AS | Assignment |
Owner name: NORTEL NETWORKS LIMITED, CANADA Free format text: CHANGE OF NAME;ASSIGNOR:NORTEL NETWORKS CORPORATION;REEL/FRAME:011195/0706 Effective date: 20000830 Owner name: NORTEL NETWORKS LIMITED,CANADA Free format text: CHANGE OF NAME;ASSIGNOR:NORTEL NETWORKS CORPORATION;REEL/FRAME:011195/0706 Effective date: 20000830 |